Effects of Minor Elements on Corrosion Resistance of Austenitic Stainless Steel in Dilute Sulphuric Acid

K. Osozawa, Y. Fukase, K. Yokota
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引用次数: 1

Abstract

produced molybdenum stainless steels, in 5 per cent sulphuric acid test designated by JIS. Among thirty kinds of elements added to the above alloy up to 0.1 per cent, the most beneficial in reducing the corrosion rate were rhodium, palladium, platinum, copper and lead, followed by cerium, hafnium, thorium, uranium, indium and tin. Titanium, niobium, tungsten and silver were also beneficial if added more than 0.1 per cent. No minor alloying elements tested increased the corrosion rate of the base alloy. The mechanism of the beneficial effects were discussed. It was pointed out that minor additions of tin and lead had a beneficial effect although these elements did not influence the corrosion potential and anodic polarization of the base alloy. By considering the characteristics of elements in melting operations and by analysing the impurities in the commercial austenitic stainless steels containing molybdenum, it is concluded that the relatively low corrosion rate of the commercially produced stainless steel in 5 per cent sulphuric acid test is attributed to the beneficial effect of residual elements, especially copper and tin.
微量元素对奥氏体不锈钢在稀硫酸中耐腐蚀性能的影响
生产的含钼不锈钢,在5%的硫酸中进行JIS指定的试验。在上述合金中添加0.1%的30种元素中,对降低腐蚀速率最有利的是铑、钯、铂、铜和铅,其次是铈、铪、钍、铀、铟和锡。如果添加量超过0.1%,钛、铌、钨和银也是有益的。在测试中,没有一种微量合金元素会增加基合金的腐蚀速度。并对其有利作用机理进行了探讨。指出少量的锡和铅的加入对碱合金的腐蚀电位和阳极极化没有影响,但对碱合金的腐蚀有有益的影响。通过对含钼奥氏体不锈钢熔炼过程中各元素特性的分析,认为含钼奥氏体不锈钢在5%硫酸试验中腐蚀速率较低,主要是由于残余元素,特别是铜和锡的有益作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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